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#' @title
#' Detect a Pattern Match
#'
#' @description
#' These functions determine, for each string in \code{str},
#' if there is at least one match to a corresponding \code{pattern}.
#'
#' @details
#' Vectorized over \code{str} and \code{pattern}.
#'
#' If \code{pattern} is empty, then the result is \code{NA}
#' and a warning is generated.
#'
#' \code{stri_detect} is a convenience function.
#' It calls either \code{stri_detect_regex},
#' \code{stri_detect_fixed}, \code{stri_detect_coll},
#' or \code{stri_detect_charclass}, depending on the argument used.
#' Relying on these underlying functions will make your code run slightly
#' faster.
#'
#' See also \code{\link{stri_startswith}} and \code{\link{stri_endswith}}
#' for testing whether a string starts or ends with a given pattern
#' match, respectively. Moreover, see \code{\link{stri_subset}}
#' for a character vector subsetting.
#'
#'
#' @param str character vector with strings to search in
#' @param pattern,regex,fixed,coll,charclass character vector defining search patterns;
#' for more details refer to \link{stringi-search}
#' @param negate single logical value; whether a no-match is rather of interest
#' @param opts_collator,opts_fixed,opts_regex a named list used to tune up
#' a search engine's settings; see
#' \code{\link{stri_opts_collator}}, \code{\link{stri_opts_fixed}},
#' and \code{\link{stri_opts_regex}}, respectively; \code{NULL}
#' for default settings;
#' @param ... supplementary arguments passed to the underlying functions,
#' including additional settings for \code{opts_collator}, \code{opts_regex},
#' \code{opts_fixed}, and so on
#'
#' @return Each function returns a logical vector.
#'
#' @examples
#' stri_detect_fixed(c("stringi R", "REXAMINE", "123"), c('i', 'R', '0'))
#' stri_detect_fixed(c("stringi R", "REXAMINE", "123"), 'R')
#'
#' stri_detect_charclass(c("stRRRingi","REXAMINE", "123"),
#'    c("\\p{Ll}", "\\p{Lu}", "\\p{Zs}"))
#'
#' stri_detect_regex(c("stringi R", "REXAMINE", "123"), 'R.')
#' stri_detect_regex(c("stringi R", "REXAMINE", "123"), '[[:alpha:]]*?')
#' stri_detect_regex(c("stringi R", "REXAMINE", "123"), '[a-zC1]')
#' stri_detect_regex(c("stringi R", "REXAMINE", "123"), '( R|RE)')
#' stri_detect_regex("stringi", "STRING.", case_insensitive=TRUE)
#'
#' @family search_detect
#' @export
#' @rdname stri_detect
stri_detect <- function(str, ..., regex, fixed, coll, charclass) {
   providedarg <- c("regex"=!missing(regex), "fixed"    =!missing(fixed),
                    "coll" =!missing(coll),  "charclass"=!missing(charclass))

   if (sum(providedarg) != 1)
      stop("you have to specify either `regex`, `fixed`, `coll`, or `charclass`")

   if (providedarg["regex"])
      stri_detect_regex(str, regex, ...)
   else if (providedarg["fixed"])
      stri_detect_fixed(str, fixed, ...)
   else if (providedarg["coll"])
      stri_detect_coll(str, coll, ...)
   else if (providedarg["charclass"])
      stri_detect_charclass(str, charclass, ...)
}

#' @export
#' @rdname stri_detect
stri_detect_fixed <- function(str, pattern, negate=FALSE, ..., opts_fixed=NULL) {
   if (!missing(...))
       opts_fixed <- do.call(stri_opts_fixed, as.list(c(opts_fixed, ...)))
   .Call(C_stri_detect_fixed, str, pattern, negate, opts_fixed)
}

#' @export
#' @rdname stri_detect
stri_detect_charclass <- function(str, pattern, negate=FALSE) {
   .Call(C_stri_detect_charclass, str, pattern, negate)
}


#' @export
#' @rdname stri_detect
stri_detect_coll <- function(str, pattern, negate=FALSE, ..., opts_collator=NULL) {
   if (!missing(...))
       opts_collator <- do.call(stri_opts_collator, as.list(c(opts_collator, ...)))
   .Call(C_stri_detect_coll, str, pattern, negate, opts_collator)
}


#' @export
#' @rdname stri_detect
stri_detect_regex <- function(str, pattern, negate=FALSE, ..., opts_regex=NULL) {
   if (!missing(...))
       opts_regex <- do.call(stri_opts_regex, as.list(c(opts_regex, ...)))
   .Call(C_stri_detect_regex, str, pattern, negate, opts_regex)
}
